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Cincinnati Society of Nattiral History. 



Exp. 29 — July 28, 1900, 9.00 A. m. "Cliffs" near Camp 

 Whitcomb. About 7,000 ft. Three agar plates were exposed 

 on some large rocks in shade for an hour. Light breeze from 

 over the canon. Location is sufficiently removed from the 

 camp so as not to be affected by it. 



Aug. 8 : 



PI. 1 — Completely dried up. 



PL 2 — 106 bacteria. 



PI. 3 — in bacteria. 



Average per 10 min., 18 bacteria. 

 The colonies were all white with only two species present. 



Exp. 30. — July 30, 1900. Camp Whitcomb. Six agar plates 

 were exposed as follows: 



PI. 1 — 15 min. 



PI. 2 and 3 — 30 min. 



PI. 4 — 60 min. 

 Time 11.45 a. m. 



They were exposed on large rock of the highest peak of 

 the Sandia Mts., altitude about 10,000 ft. A very slight 

 breeze from the west. Slight rain the previous day. 

 PI 5 ) 



^ j 10 min. Time 2.00 p. m. 



These two plates were exposed on a lower peak — altitude 

 about 8,500 ft. Double quantities of agar were used to pre- 

 vent excessive drying out of medium. 



Aug. 8— All the plates contain some colonies of bacteria, 

 and a large number of molds which have affected the results 

 detrimentally. Only one plate was counted. 



PI. 2 — 30 min. — 42 bacteria and 15 molds. 

 Average per 10 min., 14 bacteria. 

 Three species : A 2 , A w and An, the last two being white 

 and gray in color, respectively. 



Exp. 31 — Aug. 5, 1900, 5.50 p. m. 



Repeated Exp. 29. Plates contained double quantities of 

 agar to balance evaporation. 



Exposure was made in open on large rock, there being no 

 sunlight to avoid. No disturbing influences. 



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